Measuring weir



July 10, 1928.

1.676,855 c. w. CHEATHAM MEASURING WEIR Filed Oct. 6, 1926 2 Sheets-Sheet Wa ier L ev eZ N i Ches ferwCheiham July 10, 1928. l 11,676,855

C. W. CH EATHAM I MEASURING WEI R.

Filed Oct. 6, 1926 2 Sheets-Sheet 2 F-E-E Ches ter' Wfiheafham Patented July 10, 1928.

I warren stares. PATENT orr cag CHESTER w. CHEATI-IAM, onsEA'r'rLE', WASHINGTON, ASSIGNORJOIE"ONE-HALETO a v J. N. NISSEN, or SEATTLE, wnsnrne ronf ,i 1

MEASURING WEIR.

Application filed: 0etober 6, 1 926. Serial No. 139,313.

My invention relates to devices of the nature of a weir, for use in measuring and controlling the discharge of, water, and specifically to a device of this sort which will sc cure uniformity of discharge where the level of the Water supply is variable. I

My invention has been designed more particularly for usein irrigating ditches'and its object to secure uniformity of discharge under varying levels of water in the supply ditch.

My invention resides in the combination .and control the'discharge from an irrigating ditch. v

Figure 1 1s a Vertical section of the device of, that is, parallel with the. direction. of flow of the discharged Waten, i Figure 2'is an end view taken from the discharge end, one end of the fixed weir board being broken away.

Figure 3 is a plan view showing, partly in section, the mounting of themovable Weir board and the current impact or carrying board. I Y I As amatter of convenience in manufacture andinstallation of my measuring device, 'it willlbe desirable in a large proportion of cases, to provide a boxsuch that the complete deviceis self-contained. The self essential feature. Iv have secured this self contained feature in the device asillustrated by providing a box-like-casing comprising a bottom 1, sidewallslO, afixedweir board sisting of a fixed end sectionlQ-and a vertically movable gate 13 operating inguide .ways 14. i p i Such a box or casing as illustrated is in- 5 stalled with itssupply end in communicatending upstream whereby it is capable of by thev level of the discharge edge of the taken on a plane extending lengthwise there frictio contained feature is, howeveiynota strictly.

11 and a closure forthe water inlet end con tion with the ditch from whichiwate'r be taken. The gatel3permits complete up ting off of the'flow wheneverfdesiredr I At the discharge end vof the box I empl I a fixed orpermanent weir board 11., This extends above'the box b'ottoma diamant 1 responding roughly with the rangejof rise and fall ofthe movable weir board. Stated in another Way,'it is 1'1ecessary"to 'provid i f g a a o5 cally movable weir board when dropped to I- sump, of suitable depth, to. receive the vertiw its lowermost point.

" The movable weirijboar d has atleast its outer or downstream face shaped" as Seg ment of a cylinder' concentric with the pivot axis ofthe radius rods .20, which are secured to the movable weirboard at'vertically sepa j rated points as 22' at eachside of the box and arep1v0tedat'points 21' upstream from the board. These parts are so proportioned that the downstream curved face of the movablefwelr board makes as close a joint with the upstream face of the fixed weir board, 11

as is feasible Without producing a disturb ingamount of'friction. A

The 'endsof the movable weir board 2 are designed to fit close to the sidewalls lOof the'boxso' as to minimize theleakage of water therebetween. Special means ,to secure this resultmay be employed; I have shown one such means, consisting of I' the two bars and 30, thebar 3*beingsecured i to the weir'board 2 and the bar 30 to the sidewall of the box. The abutting'e'dges of thesebars are cut to a circle which is concentrlc with the pivot axis 21of the Weir board. Surfaces of thisfcharacter and posiso i tion may be madeto closelywithout great In conjunction. withthe foregoing parts I employ a current impact board lwhich is mounted upon-for secured to theweir board 2.so a sto present an inclined lower face to the current whereby the discharging water i will actthereon to raise it and support both 1 itand, the attached weir board at a level ling factors may be adjusted to thereby ip- The controlsure a continuously uniform dischargehead I and therefore a unlformvrate of d1scharge,

even with a verying head in the supply Source.

,Thecurrent impactor supporting board 4 hasside wings 40 which lie close alongside of the side walls of the box andextend upwardly to above thewater level. A' guide flange or barat'ieachsideof thebox, extends upwardly from the weir. board 2' and.

' the impact board 4 has complementalguide members 43 and 44, interengaging to permit and secure vertlcal ad ustment of the impact board relative to the wen-board, thereby to vary the depth of the discharge opening; Any suitable mannerof fixing these when 'adjusted may be employed. Means shoulda'lso be provided whereby when these parts are adjusted -they mayflbe lockedyin a position. For purposes of adjustment I" provide the guide members 5', 43 and 44 r ns lt' @[ploy a yoke 6,"the ends thereof being H:

with holes 45 for the. reception of holding To facilitate locking I .em-

to form an offsettO, which maybepassed through the holes when the yoke. body' is swung upwardly but-whi'clrcannot be removed when the yoke is down. A padlock 61 engaging the yoke 'and a 'staple'62 carried by the board 4, prevents moving of theyoke. 1.11m found that the lifting .eificiency of the board 4 is increased if. its discharge edge extended somewhat beyond the top edge of a the weir board 2 and particularly if this edge is slightly curved downwardly, as is 'shown at 41in Figure 1. I have also found that the variation offa ngle ofthe impact face ofthe board 4, due to rise and fall thereof, will vary its lifting power, but that this maybe compensated for by giving the -upper sections of the board a curvature which is slightly convex to the water, as is so built into. a box, the ,estential features .may installed otherwise than in a'boxl, The use of a box will probably be'fo'und desirable for measuring devices of moderate and usual dimensions. 'it is only necesiary to dig a trench and imbed the box therein.

simmer 42- .This curvature will'be' located at Such points and d rmined in amount by Experiment fl dftest. Y I

Extending across the box well towards its discharge end but so as to not interfere with thedropping of the weir board 2 toits lower limit, is a partition 15. This forms a sump 16 into which thelower edge of the weir board may sink and hol'dsjback any gravel and dirt which may was h int'o the box, so that it will not interfere With'the fall of the weir boardiZ;v v While I have described my invention. as

To install such. a device When in use the elevation of the discharge edgevof the weir board 2 is deterv.minedby the elevation of-the source of supply, from, which it follows that with an opening of constant area and under acon- -'-stant head, a uniform rate of discharge will 1 follow. As the device will be adjusted and locked inadjusted position by someone representing the canal organization, the deliv-- cry of the proper amount of water and no more is assured. h

To facilitate securing .a close fit between the outer faceof the movable weir board 2 and the fixed weir board 11, Ihave provided a plate 7 secured to the upper edge of the weir board and adjustable towards and from the movable weir board 2.

plemental to the one having the cylindrical face; Subject to this restrict-io'n,it may be able weiri'board. v j j WVhat I claimas'my invention is:

1. In a'water' measuring and controlling device; in combination, a fixed Weir board, a vertically movable weir board positioned at the upstream face of the fixed. board for vermounted upon either the fixed or the movtical movements, a current impact board fixed above and relative to the movable weir board, and radius rodsfixed in their relation to said movable board and extending in an upstream direction, a'fixedfpivot for the 'upstream ends of said rods,the movableweir board having a segment-cylindrical dowrr stream face concentric with thepivot axis oflthe radius rods and positioned closelyfadjacent to the upstream face of the fixed weir board.

2. In a watermeasuring and controlling device in'combination, a fixedweir board, a

vertically movable weir board 'attheupstream face of'the fixed board, and radius rodsfixed in'their relation to said movable board and extending in an upstream direc ti'on, a fixed pivotfor the upstream ends of said rods, the movable weir board'having a segment-cylindrical downstream 'face' con centric with the pivot axis of the radius rods and positioned closely adjacent to theiu'pstream face of the fixedweir board, and a current-impact board fixed in uniform relation to the movable weir board-and upward- 1y spaced therefrom and adapted by the reaction of the water thereon to maintain the discharge openingat a constant hydraulic head under'varying water'supply levels.

3. In a water measuring and controlling device, a fixed weir board, avertic'allymovableweir board, radius rods secured in fixed relation to the movable weir board and pivoted-upstream "from the board to -bring the fixed and movable weir boards in close juxtaposition of faces, a current-impact board fixed above and to move with the movable weir board in constant angular relation thereto and to present a face angu larly disposed to the current flow, and means for adjusting said current-impact board relative to the weir board to vary the depth of the discharge opening beneath it.-

4. In a water-flow controlling device, a

vertically movable weir board, a current impactboard fixedly secured relative to the said weir board at an angle to the current flow to thereby carry the Weight of the weir board, said impact board having a zone towards its upper edge c'onvexly curved to the current, and at its lower edge another zone which is concavely curved towards the current.

5. In a water measuring device, a fixed weir, board, a vertically movable weir board, means for automatically positioning the level of the movable weir board by the level-of source of water supply, and an adjustable member carried by one of the weir boards and adjustable towards and from the face of the other to control the volume of water discharge between them.- i

6. In a water measuring device, a fixed weir board, a vertically movable weir board, means controlling said movable weir board to swing about a pivot axis, the face of one of said boards which is presented toward the other being a segment of a cylinder concentric with said pivot axis,'and a plate carried by the other board, and adjustable toward and from the cylindrical surface of its complemental board. r

7 In a water flow controlling device, a weir board, radius rods fixed relative to the weir board and pivoted to swing upon an upstream pivot, guides secured to move with the weir board and extending upwardly from I and operably connected to move with the weir board, the discharge edge of said'impact board projectingbeyond the weir board and being bent downwardly.

9. In a water flow controlling device, a V e weir board, means controllingthe same for vertical movement in a circular are having its center upstream, a current impact board carr ed by the welr board, and pairs of complemental arcuate members at each side of the weir board, to preventleakage, one member of. each'pair being fixed relative to the movable weir board, and the other carried by said weir board. h

10. In a watenmeasuring device, a weir board, and means guiding the same for vertical' movement, complemental fixed weir members, a current-impact board associated with and operably connected to the movable weir board tourise and-fall therewith, and having an inclined bottom and enclosing ends to thereby compel all the discharged water to pass under said impact board.

Signed at Seattle, Washington, this 15th day of Septemeber, 1926.

orna'srnn'w. CHEATHAM. e v 

